Dynamic and fluid pressure brake control



May 19., 1931. QMCCUNE 1,805,630

DYNAMIC AND FLUID PRESSURE BRAKE CONTROL Filed Jan. 29, 1930 INVENTOR JOSEPH C. McCUNE ATTO NEY Patented ..May' 19, 1931 JOSEPH cQMacuNn, oi nnenwoon, PEN SYLVANIA, ,AssIGNon TO THE WESTINGHOUSE" Am BRAKE COMPANY-{OF I MERDINGL PENNSY V NIA; Av conPonnTIoN; 1;} i

PENNSYLVANIA DYNAMIC nNnrnurn-rnnsstmnimmn common-e we-w n filed J'anuary i29; i939, Serial :No. 424,233.

This invention'relates to vehicle brakes, and

more particularly to a brake equipment adapt ed for electro-dynamic braking or fluid pres surebraking; '7 v r Q i The principal object of my invention isto provide angninterlock ,means between the dynamic brake and'lthe fluid pressure brake;

such that under certain: conditions, the fluid 7 1 to supplement thedynamic brake. I p s t In the accompanying:drawing the SIIIglB,

figure is afdiagrammatic view of a combined dynamic and fluid pressure brake apparatus embodying invention. r

electro-dynamicbrake apparatus, since this Wellknown in the art,"a-nd accordingly,only a developed fragment v1 of theus'u'al "sequence 7 reliay drurn eis shown the dotted linesrepresenting the .difi-erent operating positions of the drum. n

t, ,The-fluid pressure ebrakei'apparatus may 7, comprise abrake valve device 2, a source-of 25 fluid under pressure suchas the main reservoir3, and abrakecylinder 4., k The brake valve device 2 comprises a casing in which is mounted a flexible diaphragm 5,

the chamber 6 at one side ofithe diaphragm :30 being vconnected. to a pipe Tleadingto thebrake cylinder 4. The chamber 8 atthetop 'o;

site side ofthe diaphragm iso enJItoIthe atrnosphere and is closedbyie cover platey9 haying a sleeve portion} 10in. which isldisv 35 ,poseda coilspring 1 1,'operativelyengaging the diaphragm 5.

An operating pin 12 engages .o f the spring and enten'dsfoutxof the sleeve o t i a e e ee y dbrf 4g operable lever 13, which is pivotally mounted upwardly bya spring l l A rocking bar 15 i disposed gin chamber -6 on the sleeve portion 10 and which-is urged pressure brake will be automatically; applied For the purpose: of this invention, it is not" deeined vnecessary to showiin theI-drawingan e,

pipe leads to the main reservoir supply pipe 19. The stems 38 and 84=of -the valves 27 and "28 eng g endf coil spring 35- urges the yvalve'28 to its'seat and'velve 27 awayfroni energized; while in all other positions of t the druni, "the magnet" will be deenergized. j

and is operable by the diaphragm 5,, through i ,o .a central pivot button Afluidpressure supply valve 17 ,is'containediin a valvecham ber 18, *Whichchamberis connected with the reservoir 3 through a pipe'19andsaid valve is urgedto itsseat by spring 2O, The valve 17 has 83mm 21 which .is adaptedto engage thej'bar 15,1 A release,valve 22is mounted a in valve chamber 23'and i'surged away froin its seat by a coil spring 24. Said valve is provided with, a stem 25 adapted to engage thebarv15. v v p p a f I For interlocking the fluid pressure brake with the dynamic brake an electr c-magnet 26 is provided which magnet is adapted to operate double. beatvalves 27 and' '28 "contained respectively in valve chambers 29 and 30. ",The'valve chamber 29 is open to the atmosphere through port 31- and the valve chamber is connected to'a pipe 32, which 1 1 111 operation when the leverfil3isfnot de -pr es's d,' as s owni thi dmiv n e pr 511 idoes snot exert pressure on diaphragm 5, fandthe spring 24C'thenajc'5ts to hold the release m1ve 22enseateu. The. chamberj 6 and the brake cylinder t are ithen connected-to pipe 37 If 1 the I1 1&gn6l 26 is not energized; the spring holds th'eivalv'e 28' seated andi-th'e new?i ijl ssets e ir -14 Open 9 to exhaust port 31 and therefore the brake cylinder 4 is exhausted to the atmosphere.

The fluid pressure brakes may be applied by depressing the lever 13 either by foot or by hand, so as to compress the spring 11. The diaphragm 5 is then flexed by the pressure'of spring 11, so as to first move the release valve 22 to its seat, and then upon fur-.

the! movement of the diaphragm, the bar 15 is rocked on the stem as a fulcrum, so as to unseat the valve 17 Fluid under pressure is then supplied from pipe 19 and the reservoir 3 to thechamber .6 and thence to the.

brake cylinder 4. When the pressure of fluid supplied to chamber 6 has been increased sufliciently to overcome the pressure of spring 11, the diaphragm 5is flexed upwardly so as to permitthe valve 17 to seat and cut oil the further supply of fluid under pressure to the brake cylinder.

The dynamic brake may be set into operation by rotating the drum 1 through its several ositions in the, usual manner. When the um has been rotated to its last two politions, the source of current is connected to magnet 26, so that said magnet is ener- The energization of magnet 26 operates to shift the valve 27 to its seat and to unseat the. valve 28, so that fluid under pressure is supplied from the main reservoirB to pipe 37. If the brake valve device is in release position, as shown in the'drawing, the release salve 22 will be unseated, so that fluid under ,ressnre supplied to pipe 37 is free to flow lb'chamber 6 and thence through pipe 7 to the brake cylinder 4, thus applylng the brakes by fluid. under pressure. In the operation of the dynamic brake, when the brake drum has been rotated to its final position, the speed of the train has been reduced to an extent that the operation of the vehicle motors as generators does not provide adequate braking tower to eflect the stoppage of the train,but y supplementing the namic braking power with fluid pres-- sure raking power as above described, the

, d sired braking force is maintained.

\Vhile one illustrative embodiment of the invention has been described in detail, it is not. my intention to limit its scope to that embodiment or otherwise than by the terms of the appended claims.

Having now described my invention, what I claim as new and desire to secure by Lettors Patent, is: I I

1. In a ve 'f 1e braking apparatus, the combination with a brake cylinder and a brake valve, device for controlling the admissionof fluid to the brake cylinder, and having a release valve for controlling the release of fluid iron;v the brake cylinder, means forcontrollin a, dynamic brake, and mechanism controied by said means for controlling the sup ply of fluid under pressure to the brake cylinder through a communication controlled by said release valve.

2. In a vehicle braking apparatus, the com bination with a brake cylinder and a brake valve device for controlling the admission of fluid to the brake cylinder, and having a reoperation of said device.

3. In a vehicle braking apparatus, the combination with a brake cylinder and a brake valve device for controlling the admission of fluid to the brake cylinder, and having a, release valve for controlling the release of fluid from the brake cylinder, a valve device for supplying fluid under pressure'to and releasing fluid from the brake cylinder throu h a communication controlled b said re ease.

valve, and means for control ing the operation of a dynamic brake and operative to control the o eration of said valve device.

4. In a vehicle braking apparatus the combination with a brake cylinder and a. brake valve device for controlling the admission of fluid to the brake cylinder, and having a release valve for controlling the release of fluid from the brake cylinder, valve means for suppl ing fluid underpressure to the brake cylin er through a communication controlled by said release valve, an electro-magnet for controlling the operation of said valve means, and a contact drum for controlling the operation of an electro-dynamic brake and having means for controlling the energization and deener 'ization of said magnet.

, 5. In a v hicle braking apparatus the combination with a brake cylinder an a brake valve device for controlling the admission of fluid to the brake cylinder, and having a release valve for controlling the release of fluid from the brake cylinder, valve means for controlling exhaust of fluid from and the su pl of fluid under pressure to the brake oy in er through a communication controlled by said release valve, electrically controlled means for controlling the operation of said 'valvemeans, and a dynamic brake controlling .der through a communication controlled by by said release valve, electrically controlled means for controlling the operation ofsaid valve means, and a dynamic brake control- 7 ling drum having sequential braking 'positions, and adapted in one or more positions to effect the energization of said electrically controlled means. V

In testimonywhereof- I have hereunto set my hand, this 27th day of January, 1930.

JOSEPH O. MOGUNE. 

